Results 71 to 80 of about 824,226 (150)

Riemannian optimization of photonic quantum circuits in phase and Fock space

SciPost Physics
We propose a framework to design and optimize generic photonic quantum circuits composed of Gaussian objects (pure and mixed Gaussian states, Gaussian unitaries, Gaussian channels, Gaussian measurements) as well as non-Gaussian effects such as photon ...
Yuan Yao, Filippo Miatto, Nicolás Quesada
doaj   +1 more source

Simple proof of the robustness of Gaussian entanglement in bosonic noisy channels

, 2011
The extremality of Gaussian states is exploited to show that Gaussian states are the most robust, among all possible bipartite continuous-variable states at fixed energy, against disentanglement due to noisy evolutions in Markovian Gaussian channels ...
Gerardo Adesso, M. A. Nielsen, M. B. Plenio   +2 more
core   +1 more source

Optimal distributed quantum sensing using Gaussian states

Physical Review Research, 2020
We find and investigate the optimal scheme of distributed quantum sensing using Gaussian states for estimation of the average of independent phase shifts. We show that the ultimate sensitivity is achievable by using an entangled symmetric Gaussian state,
Changhun Oh, Changhyoup Lee, Seok Hyung Lie, Hyunseok Jeong   +3 more
doaj   +1 more source

Photon-number moments and cumulants of Gaussian states [PDF]

Quantum
We develop closed-form expressions for the moments and cumulants of Gaussian states when measured in the photon-number basis. We express the photon-number moments of a Gaussian state in terms of the loop Hafnian, a function that when applied to a $(0,1)$-
Yanic Cardin, Nicolás Quesada
doaj   +1 more source

On the equivalence between squeezing and entanglement potential for two-mode Gaussian states. [PDF]

Sci Rep, 2023
Li B, Das A, Tserkis S, Narang P, Lam PK, Assad SM.   +5 more
europepmc   +1 more source

Distinguishing two single-mode Gaussian states by homodyne detection: An information-theoretic approach

, 2004
It is known that the quantum fidelity, as a measure of the closeness of two quantum states, is operationally equivalent to the minimal overlap of the probability distributions of the two states over all possible POVMs; the POVM realizing the minimum is ...
A. Peres, C. A. Fuchs, H. J. Carmichael, Hyunchul Nha, M. A. Nielsen, U. Leonhardt   +5 more
core   +1 more source

Post-selected von Neumann measurement with Hermite–Gaussian and Laguerre–Gaussian pointer states

New Journal of Physics, 2015
Through the von Neumann interaction followed by post-selection, we can extract not only the eigenvalue of an observable of the measured system but also the weak value.
Yusuf Turek, Hirokazu Kobayashi, Tomotada Akutsu, Chang-Pu Sun, Yutaka Shikano   +4 more
doaj   +1 more source

Noisy propagation of Gaussian states in optical media with finite bandwidth. [PDF]

Sci Rep, 2022
Teklu B, Bina M, Paris MGA.
europepmc   +1 more source

Bipartite and Multipartite Entanglement of Gaussian States

, 2007
In this chapter we review the characterization of entanglement in Gaussian states of continuous variable systems. For two-mode Gaussian states, we discuss how their bipartite entanglement can be accurately quantified in terms of the global and local ...
F. Illuminati, Fabrizio Illuminati, G. Adesso, Gerardo Adesso   +3 more
core   +2 more sources

Influence of Deterministic Attenuation and Amplification of Optical Signals on Entanglement and Distillation of Gaussian and Non-Gaussian Quantum States

EPJ Web of Conferences, 2015
We study general rules of entanglement dynamics for two-mode continuous variable states subjected to deterministic phase-insensitive attenuation and amplification.
Filippov S.N.
doaj   +1 more source